Diffusion soldering method capable of making copper-aluminium joint binding strength high

A technology combining strength and brazing method, applied in the direction of welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of high cost and limitation, achieve short production cycle, low manufacturing cost, and realize mass production Effect

Inactive Publication Date: 2006-03-08
北京中纺精业机电设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, friction welding can only be used for welding copper-aluminum pipe joints. Ultrasonic welding and pressure welding equipment are complex an...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the red copper plate C11000 (T of thickness 1mm 2 ) and vacuum diffusion brazing of pure aluminum plate 1035 (L4) with a thickness of 6mm, the length of the workpiece is 80mm, and the width is 60mm.

[0024] The specific process steps are as follows:

[0025] Before welding, immerse the pure aluminum plate 1035 and Al-Si-Mg solder in 30% nitric acid (with a concentration of 58%-62% NHO) at 25-30°C 3 + pure water preparation) in aqueous solution, soak for 8 to 12 minutes (12 minutes for aluminum plate, 8 minutes for flake Al-Si-Mg solder), remove the oil stain and oxide film on the surface, and then rinse with cold water and hot water, Blow dry with hot air; put the red copper plate in 10% NaOH aqueous solution with a mass volume percentage of 80-90°C, soak for 10 minutes, take it out and rinse its surface with clean water, after drying, place it in a solution containing a mass volume percentage of 10% Dip in 2% sodium carbonate and 12.5% ​​sulfuric acid ...

Embodiment 2

[0027] Embodiment 2: the red copper plate C11000 (T of thickness 2mm 2 ) and vacuum diffusion brazing of anti-rust aluminum plate 3A12 (LF21) with a thickness of 4mm, workpiece size: copper plate 60mm×40mm, aluminum plate 100mm×40mm.

[0028] The specific process steps are as follows:

[0029] Before welding, immerse the anti-rust aluminum plate 3A12 and Al-Si-Mg solder into 30% nitric acid (with a concentration of 58% to 62% NHO 3 +Purified water preparation) aqueous solution, at 28~35℃ for 10~12min (12min for aluminum plate, 10min for flake Al-Si-Mg brazing material), remove the oil stain and oxide film on the surface, and then rinse with cold water 1. After rinsing with hot water, dry; place the red copper plate in a 10% NaOH aqueous solution with a mass volume percentage of 85°C, soak for 8 minutes, take it out and rinse its surface with clean water, dry it, and then place it in a Immerse in an aqueous solution of 3% sodium carbonate and 12.5% ​​sulfuric acid at a temper...

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Abstract

A diffusion soldering method for making the jointing strength of copper-aluminium joint high is disclosed. Place the flaky Al-Si-Mg solder (after being removed oxide film from the surface) between the faces to be welded of the copper plate and the aluminium plate folded each other which are clamped by stainless steel plate and put into the vacuum furnace to conduct vacuum soldering. The craftwork parameter as follows: programming rate: 10-20 deg.C/min, when the temperature raises to 300-350 deg.C and 510-540 deg.C, keep the temperature 5min respectively, then continues to rise the temperature to 616-624 deg.C, and keep the temperature for 4-6 minutes. The invention realizes high reliability joining of copper and aluminum, good interface of composite plate, good sealing performance and smooth beauty joint part. The shear strength of the interface is 60Mpa and the tensile strength of the interface is more than 100Mpa.

Description

technical field [0001] The invention relates to a welding method between copper and aluminum dissimilar metals, in particular to a vacuum diffusion brazing method for increasing the joint strength of copper and aluminum, and belongs to the field of welding technology. Background technique [0002] Due to the complementary advantages of copper and aluminum in thermal conductivity, electrical conductivity and cost, copper-aluminum joints have broad application prospects in chemical, electric power, refrigeration and other industrial fields. Aluminum and copper to form joints can reduce costs, reduce the weight of components and play their respective performance advantages. However, due to the large difference in the melting point and physical and chemical properties of copper and aluminum, and the fact that an oxide film is easily formed on the surface of aluminum during the welding process, it is very difficult to achieve reliable welding of copper-aluminum joints. [0003] ...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K35/28
Inventor 李亚江王娟张永兰
Owner 北京中纺精业机电设备有限公司
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